Вопрос школьника по предмету Геометрия
Длина радиуса окружности меньше длины диаметра на 15мм.Найдите длину диаметра.
Ответ учителя по предмету Геометрия
D=2*r; пусть D=X мм , тогда r=(x-15) мм. составляем выражение: x= 2*(x-15). x=2x-30; x-2x=30, -x=-30, x=(-30):(-1), x=30. Ответ : длина диаметра равна 30 мм.
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